1. an undersea mountain range is called
a) rift
b) seafloor spreading
c) mid-ocean ridge
d) continental drift

2. what fuels sea floor spreading?
a) convection currents
b) the crust
c) subduction
d) convergent boundaries

3. process by which new ocean crust forms
a) seafloor spreading
b) continental drift
c) mid-ocean ridge
d) rift

4. which picture demonstrates a divergent plate boundary? (the picture is at the )
a) a
b) b
c) c
d) none of the above

5. what is plate tectonics?
a) the theory of plates moving slowly over the mantle
b) the theory of mountain forming
c) the theory of plates subducting under the mantle
d) the theory of pangaea

6. the newest seafloor is located?
a) closest to the mid-ocean ridge
b) farthest from the mid-ocean ridge
c) in the mantle

7. what is the driving force behind the convention occurring in the earth’s mantle?
a) heat from the sun
b) heat from the earth’s core
c) friction from rock material moving around
d) magnetic pull from the moon

8. when looking at the mid ocean range, the oldest rocks are
a) in the middle
b) found far from the mid ocean ridges
c) found close to the rift zone
d) in the mantle

9. convection currents in the mantle leads to movement in
a) asthenosphere
b) earth’s core
c) lithosphere
d) pacific ocean

10. what is seafloor spreading?
a) new areas of oceanic crust occurring through the up welling of magma at mid ocean ridges
b) the moon
c) a thing in the ocean
d) mid-ocean trenches continually add new material to the ocean floor

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation:

a plasma is a warm ionized gasoline consisting of approximately equal numbers of definitely charged ions and negatively charged electrons. the characteristics of plasmas are notably unique from the ones of ordinary neutral gases in order that plasmas are considered a awesome "fourth kingdom of remember."

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).